How do you check software version?

[Ryot Control]

I'm reading that some achievements are unachievable depending on the version that you have until the next update is pushed. I was one of the guys who managed to download the game early, but I don't know how to verify which version software I have on my phone. Anyone know where I can find this information?

I guess another question to ask is which version is worth working on, since it seems that the pre-release version might actually be harder.